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          mysql基础架构
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        <h3 id="一、Mysql的基础架构"><a href="#一、Mysql的基础架构" class="headerlink" title="一、Mysql的基础架构"></a>一、Mysql的基础架构</h3><p>首先上个图，描述MySql的基础架构：</p>
<p><img src="http://m.qpic.cn/psb?/V14N9n6L0m5MHY/naMkWd.Fc5nnDmOCfadB**zaG7uFi.o8zb0id0d5Qlw!/b/dFQBAAAAAAAA&bo=oAU4BAAAAAADB7s!&rf=viewer_4" alt=""></p>
<hr>
<p>Mysql的架构主要分为两大部分，Server和存储引擎。Server层主要负责 跨存储引擎的功能 实现，如连接，分析，优化，调用引擎接口，而存储引擎 负责数据的存储和提取 。</p>
<a id="more"></a>

<h3 id="二、Server层"><a href="#二、Server层" class="headerlink" title="二、Server层"></a>二、Server层</h3><h4 id="连接器："><a href="#连接器：" class="headerlink" title="连接器："></a>连接器：</h4><p>​        首先，使用数据库会先连接到数据库，这个时候就是连接器在起作用， 连接器负责跟客户端建立连接、获取权限、维持和管理连接 。如下命令：</p>
<figure class="highlight"><table><tr><td class="gutter"><pre><span class="line">1</span></pre></td><td class="code"><pre><span class="line">mysql -u**** -p****</span></pre></td></tr></table></figure>

<p>命令输完后，连接开始工作：</p>
<ul>
<li><p>如果用户名或密码不对，你就会收到一个”Access denied for user”的错误，然后客户端程序结束执行 </p>
</li>
<li><p>如果用户名密码认证通过，连接器会到权限表里面查出你拥有的权限。之后，这个连接里面的权限判断逻辑，都将依赖于此时读到的权限</p>
</li>
</ul>
<p>这就意味着，一个用户成功建立连接后，即使你用管理员账号对这个用户的权限做了修改，也不会影响已经存在连接的权限。修改完成后，只有再新建的连接才会使用新的权限设置。</p>
<p>连接完成后，如果你没有后续的动作，这个连接就处于空闲状态，你可以在show processlist命令中看到它。其中的Command列如果显示为“Sleep”，就表示现在系统里面有一个空闲连接。</p>
<h4 id="查询缓存"><a href="#查询缓存" class="headerlink" title="查询缓存"></a>查询缓存</h4><p>Mysql8以后彻底取消该功能， MySQL拿到一个查询请求后，会先到查询缓存看看，之前是不是执行过这条语句。之前执行过的语句及其结果可能会以key-value对的形式，被直接缓存在内存中。key是查询的语句，value是查询的结果。如果你的查询能够直接在这个缓存中找到key，那么这个value就会被直接返回给客户端。 </p>
<p>建议是不使用缓存查询，失败率高，每次更新操作都会导致整个表的缓存失效。但是 MySQL也提供了这种“按需使用”的方式。你可以将参数query_cache_type设置成DEMAND，这样对于默认的SQL语句都不使用查询缓存。而对于你确定要使用查询缓存的语句，可以用SQL_CACHE显式指定，像下面这个语句一样： </p>
<figure class="highlight sql"><table><tr><td class="gutter"><pre><span class="line">1</span></pre></td><td class="code"><pre><span class="line"><span class="keyword">select</span> <span class="keyword">SQL_CACHE</span> * <span class="keyword">from</span> T <span class="keyword">where</span> <span class="keyword">column</span> = ?;</span></pre></td></tr></table></figure>



<h4 id="分析器"><a href="#分析器" class="headerlink" title="分析器"></a>分析器</h4><p>分析器就是Mysql判断怎么做的步骤，分析器先会做”词法分析 “，将输入语句的字符串<strong>分解出关键字</strong>，如”select“，表名”T“等，之后对分解后的关键字做” 语法分析 “， 会根据语法规则，<strong>判断你输入的这个SQL语句是否满足MySQL语法</strong> 。 如果你的语句不对，就会收到“You have an error in your SQL syntax”的错误提醒 。</p>
<h4 id="优化器"><a href="#优化器" class="headerlink" title="优化器"></a>优化器</h4><p>现在，Mysql知道了要做什么了，优化器将决定怎么去做。 优化器是在表里面有多个索引的时候，<strong>决定使用哪个索引</strong>；或者在一个语句有多表关联（join）的时候，<strong>决定各个表的连接顺序</strong> 。 优化器阶段完成后，这个语句的执行方案就确定下来了，然后进入执行器阶段 。</p>
<h4 id="执行器"><a href="#执行器" class="headerlink" title="执行器"></a>执行器</h4><p> MySQL通过分析器知道了要做什么，并通过优化器知道了该怎么做，于是就进入了执行器阶段，开始执行语句 。</p>
<p> 开始执行的时候，<strong>要先判断一下你对这个表T有没有执行查询的权限</strong>，如果没有，就会返回没有权限的错误，如下所示(在工程实现上，如果命中查询缓存，会在查询缓存放回结果的时候，做权限验证。查询也会在优化器之前调用precheck验证权限) 。</p>
<figure class="highlight sql"><table><tr><td class="gutter"><pre><span class="line">1</span></pre></td><td class="code"><pre><span class="line"><span class="keyword">select</span> * <span class="keyword">from</span> T <span class="keyword">where</span> <span class="keyword">name</span> = <span class="string">"李四"</span>;</span></pre></td></tr><tr><td class="gutter"><pre><span class="line">2</span></pre></td><td class="code"><pre><span class="line"></span></pre></td></tr><tr><td class="gutter"><pre><span class="line">3</span></pre></td><td class="code"><pre><span class="line">ERROR 1142 (42000): <span class="keyword">SELECT</span> command denied <span class="keyword">to</span> <span class="keyword">user</span> <span class="string">'uncheck'</span>@<span class="string">'localhost'</span> <span class="keyword">for</span> <span class="keyword">table</span> <span class="string">'T'</span></span></pre></td></tr></table></figure>

<p> 如果有权限，再打开表继续执行。打开表的时候，执行器就会根据表的引擎定义，去使用这个引擎提供的接口 。</p>
<p>如果没有索引，执行流程如下：</p>
<ol>
<li>调用InnoDB引擎接口取这个表的第一行，判断name值是不是李四，如果不是则跳过，如果是则将这行存在结果集中</li>
<li>调用引擎接口取“下一行”，重复相同的判断逻辑，直到取到这个表的最后一行 </li>
<li>执行器将上述遍历过程中所有满足条件的行组成的记录集作为结果集返回给客户端</li>
</ol>
<p><strong>对于有索引的表，执行的逻辑也差不多。第一次调用的是“取满足条件的第一行”这个接口，之后循环取“满足条件的下一行”这个接口，这些接口都是引擎中已经定义好的</strong> 。</p>

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